refactor: replace strip-ansi with stripVTControlCharacters from node:util

[AriPerkkio]

Description

• TIL ⭐ from this friendly comment that strip-ansi has Node built-in replacement: How to disable terminal colors in the vitest snashots? #6587 (reply in thread)
• Removes strip-ansi from direct dependencies. It's still a transitive dependency of other transitive dependencies from the same author.

vitest/packages/vitest/package.json

Lines 117 to 119 in 9edfa19

	"engines": {
	"node": "^18.0.0 || >=20.0.0"
	},

ari ~/Git/vitest (chore/strip-ansi) $ node
Welcome to Node.js v18.0.0.
Type ".help" for more information.
> util.stripVTControlCharacters
[Function: stripVTControlCharacters]
>

ari ~/Git/vitest (chore/strip-ansi) $ node
Welcome to Node.js v20.0.0.
Type ".help" for more information.
> util.stripVTControlCharacters
[Function: stripVTControlCharacters]
> 

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[netlify]

✅ Deploy Preview for vitest-dev ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	ab730b7
🔍 Latest deploy log	https://app.netlify.com/sites/vitest-dev/deploys/66fc47a3cee72200082e6d8b
😎 Deploy Preview	https://deploy-preview-6608--vitest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for vitest-dev ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	6e0f85c
🔍 Latest deploy log	https://app.netlify.com/sites/vitest-dev/deploys/66fce7214de7770009c0c7a9
😎 Deploy Preview	https://deploy-preview-6608--vitest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.